scotto wrote:Sad, but on a lighter side..“Honey, I think I need a full carbon bike and wheelset now"...

..... bugger me - mental blank - carbon is non conductive right !

Ah no, carbon is very conductive, go to your local fishing shop & have a look at a high end carbon rod, it'll have a warning sticker on it, it must do by Australian Standards.

The nature of cycling is that except for some rare custom bamboo & wood bicycles most of the stuff we ride is conductive.

That being said, tyres are air filled rubber (well silca actually) they are not conductive, so you have to wonder about what voltage was involved to bridge the gap between the rim & the ground (earth). Also, why wouldn't you see a rather large power cable hanging in front of you, a metre from the ground?

If this is genuine then I hope the cyclist involved recovers completely, but I'd personally file this one in the urban myth category.

Wal42 wrote: That being said, tyres are air filled rubber (well silca actually) they are not conductive, so you have to wonder about what voltage was involved to bridge the gap between the rim & the ground (earth). Also, why wouldn't you see a rather large power cable hanging in front of you, a metre from the ground?

If this is genuine then I hope the cyclist involved recovers completely, but I'd personally file this one in the urban myth category.

Riding along (8.40am) in the bush. Dappled light and shade. Rides into a wire in the shade - maybe not a big thick cable - 1m above the ground and it contacts the frame. Rider stops being all tangled, puts foot on the ground...........

There are a lot of power facilities about there as Alcoa runs a big power station for their own needs using the local coal mine. But maybe it was just a domestic power supply as there is reference to "the utility company".

Wouldn't of taken much if the cable was around a corner. No time to brake, didn't see it in time, etc.

It was also a mains power line coming into the camping ground. 22,000V or something similar, minimal insulation.

I was actually camping in the same park the morning it happened. Extremely fast response to the incident.Police on dirtbikes there within 15 minutes. Followed by a fire truck, 2 ambulances, 2 police fwd, and another paramedic vehicle.

@wal42Carbon fiber is not very conductive. The formation of a atoms in carbon fiber prevent it from being highly conductive. The stickers on the rods are most likely for liability issues. If they advertised them as lightning proof and someone was shocked because maybe their rod was wet then they would have a huge case on their hands. Graphite on the other hand (also made of carbon) is highly conductive.

gorilla monsoon wrote:A surprising lack of sympathy here for the rider concerned. Personally, I hope he makes a complete recovery (if that is possible) and my thoughts and best wishes go to him and his family.

I thought the electricity companies had some fandangled special super power (no pun intended) that automatically turned off wires if they came into contact with the ground or shorted etc.? Isn't that part of the whole stopping bushfires thing???

Poor guy - I hope he recovers from his zapping. What a horrible thing to happen.

Summernight wrote:I thought the electricity companies had some fandangled special super power (no pun intended) that automatically turned off wires if they came into contact with the ground or shorted etc.? Isn't that part of the whole stopping bushfires thing???

Poor guy - I hope he recovers from his zapping. What a horrible thing to happen.

It sounds like the conductor in question was merely low-hanging. The protection wouldn't kick-in until it touched the ground or something connected to the ground (eg a tree).

I hope the cyclist makes a quick and full recovery.

It would not be at all strange if history came to the conclusion that the perfection of the bicycle was the greatest achievement of the nineteenth century.

A fire on the cross arm caused one wire to fall down to hang around 1 metre from the ground.

The article says he is critical but stable. At least the "stable" part is good news. These things can take quite a bit to recover from, especially if high voltage was involved (HV is more likely to start a fire on the cross arm, plus most cables that are not running alongside a road would be HV, so it is likely in this instance)

As far as the word "electrocute"... I am an electrical engineer in heavy industry and so consequently I receive numerous reports on electrical incidents written by government inspectors around the world (often there is some specific learning, but sometimes they seem to be used in a similar way to those "shock" road trauma ads). These official reports seem to universally use the term "electrocuted" (with no further explanation) to mean a fatality, and use the term "electric shock" for non fatal incidents and this is well understood within the industry.

electrocute |ɪˈlɛktrəkjuːt|verb [ with obj. ]: injure or kill (someone) by electric shock: a man was electrocuted on the rail track.

May I ask which dictionary you got that from? If it were mine, I would be contacting the publishers requesting a correction. I have checked multiple dictionaries and they all insist that electrocution is fatal.

Summernight wrote:I thought the electricity companies had some fandangled special super power (no pun intended) that automatically turned off wires if they came into contact with the ground or shorted etc.? Isn't that part of the whole stopping bushfires thing???

The highest voltage transmission lines, and some of the more recently equipped distribution lines can have high speed protections that disconnect the power in around 100 milliseconds. Older lines and long rural transmission lines oftencan take seconds or more; worse it can be difficult for the protection to discriminate between high load levels anda fatal shock current - so it might not even trip the line. The latter possibility is why you are advised never totouch a power line lying on the ground, nor attempt to rescue a person who's in contact with a fallen line unlessyou have appropriate insulating tools (e.g. long wooden broom handle).

In the best case, it comes down to whether the 100 milliseconds fault duration includes the heart's critical repolarization phase - IIRC its about 1/3 the heartbeat. At 90 bpm, each heartbeat is 660 milliseconds long, so there is a big window (2/3 the heartbeat) where you can be lucky enough to survive. But if the line has a slower protection, the outcome will be grim.

Cheers

WombatK

Somebody has to do something, and it's just incredibly pathetic that it has to be us -Jerry Garcia

Summernight wrote:I thought the electricity companies had some fandangled special super power (no pun intended) that automatically turned off wires if they came into contact with the ground or shorted etc.? Isn't that part of the whole stopping bushfires thing???

The highest voltage transmission lines, and some of the more recently equipped distribution lines can have high speed protections that disconnect the power in around 100 milliseconds. Older lines and long rural transmission lines oftencan take seconds or more; worse it can be difficult for the protection to discriminate between high load levels anda fatal shock current - so it might not even trip the line. The latter possibility is why you are advised never totouch a power line lying on the ground, nor attempt to rescue a person who's in contact with a fallen line unlessyou have appropriate insulating tools (e.g. long wooden broom handle).

In the best case, it comes down to whether the 100 milliseconds fault duration includes the heart's critical repolarization phase - IIRC its about 1/3 the heartbeat. At 90 bpm, each heartbeat is 660 milliseconds long, so there is a big window (2/3 the heartbeat) where you can be lucky enough to survive. But if the line has a slower protection, the outcome will be grim.

Cheers

Thanks for the knowledge. Handy to know.

So the wire hadn't previously been tripped and possibly it did have the trip protection and that is why the cyclist who hit it survived.

Summernight wrote:So the wire hadn't previously been tripped and possibly it did have the trip protection and that is why the cyclist who hit it survived.

The wire was hanging 1 metre from the ground (probably hanging between the poles either side of the one where the cross-arm fire was) and without touching the ground would not have tripped until a human completed the circuit to the ground.

Although, even when wires do touch the ground it is not guaranteed to trip (and this has caused numerous fatalities worldwide)

Who is online

About the Australian Cycling Forums

The largest cycling discussion forum in Australia for all things bike; from new riders to seasoned bike nuts, the Australian Cycling Forums are a welcoming community where you can ask questions and talk about the type of bikes and cycling topics you like.